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Hyalite

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Image:Hialit, opal szklany Czechy ok. Podboran.jpg
Image:Hyalite fluorescence.jpg

Hyalite is a form of opal with a glassy appearance. It is also called Muller's Glass. Its Mohs hardness is 5.5-6 and it has a specific gravity of 2.1. It is an amorphous form of silica. Its has a conchoidal fracture, a vitreous luster and a white streak.

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